This raises an interesting idea: why not create two passwords for encrypted drives, one password decrypt the drive, another password completely wipes the drive. This way if someone is forced to give a password to decrypt something, that password renders the data moot. Thoughts?
A friend of mine used to keep a massive electromagnet in is PC tower, that would theoretically wipe the hard drives when switched on. We never tried it. (He wasn't dealing in CP, just pirating mass quantities of movies and music).